Sorry, but acronyms like SWIM are not allowed here and they provide you no legal protection whatsoever. Please read the rules. Every poster on BL must acquiesce to the BLUA and every subforum's inidividual guidelines. Posters who do not are subject to warnings/infractions at the discretion of the appropriate staff. Even though we are all pretty lenient on the whole, just keep that in mind.
As for your question, MDMA that hasn't been heavily cut should fall within the dosage range of 100-200mg (depending on your weight) under normal circumstances. A general factor such as tolerance can greatly affect the effectiveness of mdma, as well as medications that also act upon the serotonin receptors (eg. SSRI's).
Hmm, I was going to continue, but seriously read the stickies from above. I would just end up saying what it says, particularly the "Six simple rules to mdma."
Man, I hope you are not a troll and wasting my time (as in you know all of this already), but on the tiny off-chance that you are not, a gram of MDMA at a time is ludicrous, especially if you are not extremely familiar with the drug and its effects on your body. Yes, you most likely won't die or need to be taken to the hospital, but you will probably floored to the maximum and unable to properly enjoy the trip. In any case, it is ill advised. And from the way you are describing it, it's either not MDMA or it's cut to shit. Please use a test kit.